Chapter 4: Dispersion of Light - Science Mcqs for Grade 7 - Set 4

1)   Periscope is used in submarines to see the happenings of events

a. above sea level
b. on sea level
c. in algae abundant ares
d. behind a wall or a barrier
Answer  Explanation 

ANSWER: in algae abundant ares

Explanation:
No explanation is available for this question!


2)   When red and blue are combined together, they form

a. yellow
b. magenta
c. orange
d. purple
Answer  Explanation 

ANSWER: magenta

Explanation:
No explanation is available for this question!


3)   A magenta filter absorbs

a. all colors except red
b. all colors except magenta
c. magenta only
d. magenta and its components
Answer  Explanation 

ANSWER: all colors except magenta

Explanation:
No explanation is available for this question!


4)   Most of the objects we see

a. produce colors
b. produce lights
c. do not produce lights
d. do not produce colors
Answer  Explanation 

ANSWER: do not produce lights

Explanation:
No explanation is available for this question!


5)   A colored film that fits over a lamp or camera to change the color of the light passing through it, is known as

a. effecter
b. film
c. filter
d. effect
Answer  Explanation 

ANSWER: filter

Explanation:
No explanation is available for this question!


6)   Light travels

a. faster than sound
b. slower than sound
c. faster than gamma rays
d. faster than x-rays
Answer  Explanation 

ANSWER: faster than sound

Explanation:
No explanation is available for this question!


7)   When light enters a less dense medium, it bends

a. away from the normal path
b. towards the normal path
c. away from the plane
d. towards the plane
Answer  Explanation 

ANSWER: away from the normal path

Explanation:
No explanation is available for this question!


8)   The rods are mostly found

a. in the center of retina
b. at the blind spot
c. at the edges of retina
d. above and below retina
Answer  Explanation 

ANSWER: at the edges of retina

Explanation:
No explanation is available for this question!


9)   The color blindness occurs due to

a. lack of rods
b. problem in rods
c. problem in cones
d. variation in cones
Answer  Explanation 

ANSWER: problem in cones

Explanation:
No explanation is available for this question!


10)   Things that give off light are known as

a. non luminous objects
b. luminous objects
c. transparent objects
d. opaque objects
Answer  Explanation 

ANSWER: luminous objects

Explanation:
No explanation is available for this question!


11)   The convex lens is also known as

a. converging lens
b. diverging lens
c. dispersing lens
d. conducting lens
Answer  Explanation 

ANSWER: converging lens

Explanation:
No explanation is available for this question!


12)   Light is refracted in air. It enters our eyes through different angle this is why

a. dizziness occurs
b. mirages appear
c. close objects move far
d. far objects seem closer
Answer  Explanation 

ANSWER: mirages appear

Explanation:
No explanation is available for this question!


13)   The light which is refracted the least, is

a. violet light
b. red light
c. blue light
d. orange light
Answer  Explanation 

ANSWER: red light

Explanation:
No explanation is available for this question!


14)   Some objects look white in color like snow because they

a. reflect all colors
b. absorb all colors
c. refract all colors
d. absorb white color
Answer  Explanation 

ANSWER: reflect all colors

Explanation:
No explanation is available for this question!


15)   The change in speed of light when entering water is

a. 5,000 km/s
b. 50,000 km/s
c. 100,000 km/s
d. 200,000 km/s
Answer  Explanation 

ANSWER: 50,000 km/s

Explanation:
No explanation is available for this question!


16)   White light is a mixture of

a. seven colors
b. nine colors
c. fourteen colors
d. fifteen colors
Answer  Explanation 

ANSWER: seven colors

Explanation:
No explanation is available for this question!


17)   The refractive index assumes the entrance of light from

a. glass
b. water
c. vacuum
d. gas
Answer  Explanation 

ANSWER: vacuum

Explanation:
No explanation is available for this question!


18)   Inside rain droplet, light

a. is refracted twice
b. is refracted thrice
c. is reflected once
d. is reflected twice
Answer  Explanation 

ANSWER: is reflected once

Explanation:
No explanation is available for this question!


19)   The lens in a human eye is

a. convex
b. concave
c. biconcave
d. biconvex
Answer  Explanation 

ANSWER: biconvex

Explanation:
No explanation is available for this question!


20)   If the angle of incidence of light while leaving the denser object is zero, the light would

a. be reflected back
b. go straight without any refraction
c. be refracted
d. end up at the boundary of the object
Answer  Explanation 

ANSWER: go straight without any refraction

Explanation:
No explanation is available for this question!